An undercover police narcotics unit working the East Somerville area last Thursday took notice of a man who they believed was engaged in activities consistent with narcotics trafficking.

The suspect, later identified as Robert Scofield, 27, was observed walking near Broadway and Franklin Street, frequently pausing and speaking on his cell phone, according to reports.

The officers followed Scofield in their unmarked car, observing his actions and who he met as he moved through the area.

Scofield was reportedly seen walking along Rt. 99 through Boston and into Everett, according to police, then along Meacham St., eventually stopping to meet someone in a car who he met with in the parking lot of McDonald’s. Scofield entered the vehicle and it drove away, stopping again at a nearby Dunkin’ Donuts parking lot, police said.

As soon as the car stopped, Scofield was reportedly observed exiting the car and he again started walking along Broadway, through the Sullivan Sq. rotary.

At the Vernon St. intersection, Scofield was reportedly stopped to speak to a pair of individuals that police said were known to them as narcotics users.

As Scofield resumed walking, police intercepted and detained him. Police reports indicate that Scofield appeared nervous suffered from a severe case of dry mouth as he was questioned. A pat search reportedly turned up several plastic bags that was suspected by police to contain heroin.

Scofield was placed under arrest and charged with possession of a class A drug.